feat(api): kind-scoped deployment resolution

Resolve deployments by (name, kind) via the core per-kind stores / registry.get:
- get_service resolves a service-or-static; get_job a job; get_component returns
  the first kind for a name (the /services|/jobs|/tools/{name} endpoints are the
  unambiguous addresses). _save_deployment stores into the kind store, preferring
  the existing same-named deployment on a partial patch (can't derive kind from a
  partial payload). delete/set-enabled act across a name's kinds.
- All iterate-all loops use registry.all(); lookups use registry.get/named.
- services.py/logs.py resolve the managed deployment and use kind-aware unit names.
- mqtt registry (de)serialization keyed by composite "<kind>/<name>".
API + core suites green (85 + 182).

castle-api/src/castle_api/logs.py

@@ -8,6 +8,8 @@ from collections.abc import AsyncGenerator
 from fastapi import APIRouter, HTTPException, Query, status
 from starlette.responses import StreamingResponse
 
+from castle_core.generators.systemd import unit_name
+
 from castle_api.config import get_castle_root
 
 router = APIRouter(prefix="/logs", tags=["logs"])
@@ -27,20 +29,24 @@ async def get_logs(
         from castle_core.config import load_config
 
         config = load_config(root)
-        dep = config.deployments.get(name)
-        is_managed = dep is not None and getattr(dep, "manage", None) is not None
-        if not is_managed:
+        # A name may span kinds — the managed (systemd) one owns the journal.
+        dep_kind = next(
+            ((k, s) for k, s in config.deployments_named(name) if getattr(s, "manage", None)),
+            None,
+        )
+        if dep_kind is None:
             raise HTTPException(
                 status_code=status.HTTP_404_NOT_FOUND,
                 detail=f"'{name}' is not a managed service",
             )
+        kind, _spec = dep_kind
     else:
         raise HTTPException(
             status_code=status.HTTP_404_NOT_FOUND,
             detail="Castle root not available",
         )
 
-    unit = f"{UNIT_PREFIX}{name}.service"
+    unit = unit_name(name, kind)
 
     if follow:
         return StreamingResponse(